Nipple



FIG. 1 is a perspective view of a nipple, showing my new design;

FIG. 2 is a front view of the nipple of FIG. 1;

FIG. 3 is a top view of the nipple of FIG. 1;

FIG. 4 is a perspective view of a second embodiment of the nipple, showing my new design;

FIG. 5 is a front view of the nipple of FIG. 4; and,

FIG. 6 is a top view of the nipple of FIG. 4.

The broken line showing in FIGS. 4-6 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a nipple, as shown and described. 